# verify.py - repository integrity checking for Mercurial
#
# Copyright 2006, 2007 Matt Mackall <[email protected]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2, incorporated herein by reference.

from node import nullid, short
from i18n import _
import revlog, util, error

def verify(repo):
   lock = repo.lock()
   try:
       return _verify(repo)
   finally:
       lock.release()

def _verify(repo):
   mflinkrevs = {}
   filelinkrevs = {}
   filenodes = {}
   revisions = 0
   badrevs = set()
   errors = [0]
   warnings = [0]
   ui = repo.ui
   cl = repo.changelog
   mf = repo.manifest

   if not repo.cancopy():
       raise util.Abort(_("cannot verify bundle or remote repos"))

   def err(linkrev, msg, filename=None):
       if linkrev != None:
           badrevs.add(linkrev)
       else:
           linkrev = '?'
       msg = "%s: %s" % (linkrev, msg)
       if filename:
           msg = "%s@%s" % (filename, msg)
       ui.warn(" " + msg + "\n")
       errors[0] += 1

   def exc(linkrev, msg, inst, filename=None):
       if isinstance(inst, KeyboardInterrupt):
           ui.warn(_("interrupted"))
           raise
       err(linkrev, "%s: %s" % (msg, inst), filename)

   def warn(msg):
       ui.warn(msg + "\n")
       warnings[0] += 1

   def checklog(obj, name, linkrev):
       if not len(obj) and (havecl or havemf):
           err(linkrev, _("empty or missing %s") % name)
           return

       d = obj.checksize()
       if d[0]:
           err(None, _("data length off by %d bytes") % d[0], name)
       if d[1]:
           err(None, _("index contains %d extra bytes") % d[1], name)

       if obj.version != revlog.REVLOGV0:
           if not revlogv1:
               warn(_("warning: `%s' uses revlog format 1") % name)
       elif revlogv1:
           warn(_("warning: `%s' uses revlog format 0") % name)

   def checkentry(obj, i, node, seen, linkrevs, f):
       lr = obj.linkrev(obj.rev(node))
       if lr < 0 or (havecl and lr not in linkrevs):
           if lr < 0 or lr >= len(cl):
               msg = _("rev %d points to nonexistent changeset %d")
           else:
               msg = _("rev %d points to unexpected changeset %d")
           err(None, msg % (i, lr), f)
           if linkrevs:
               warn(_(" (expected %s)") % " ".join(map(str, linkrevs)))
           lr = None # can't be trusted

       try:
           p1, p2 = obj.parents(node)
           if p1 not in seen and p1 != nullid:
               err(lr, _("unknown parent 1 %s of %s") %
                   (short(p1), short(n)), f)
           if p2 not in seen and p2 != nullid:
               err(lr, _("unknown parent 2 %s of %s") %
                   (short(p2), short(p1)), f)
       except Exception, inst:
           exc(lr, _("checking parents of %s") % short(node), inst, f)

       if node in seen:
           err(lr, _("duplicate revision %d (%d)") % (i, seen[n]), f)
       seen[n] = i
       return lr

   revlogv1 = cl.version != revlog.REVLOGV0
   if ui.verbose or not revlogv1:
       ui.status(_("repository uses revlog format %d\n") %
                      (revlogv1 and 1 or 0))

   havecl = len(cl) > 0
   havemf = len(mf) > 0

   ui.status(_("checking changesets\n"))
   seen = {}
   checklog(cl, "changelog", 0)
   for i in repo:
       n = cl.node(i)
       checkentry(cl, i, n, seen, [i], "changelog")

       try:
           changes = cl.read(n)
           mflinkrevs.setdefault(changes[0], []).append(i)
           for f in changes[3]:
               filelinkrevs.setdefault(f, []).append(i)
       except Exception, inst:
           exc(i, _("unpacking changeset %s") % short(n), inst)

   ui.status(_("checking manifests\n"))
   seen = {}
   checklog(mf, "manifest", 0)
   for i in mf:
       n = mf.node(i)
       lr = checkentry(mf, i, n, seen, mflinkrevs.get(n, []), "manifest")
       if n in mflinkrevs:
           del mflinkrevs[n]
       else:
           err(lr, _("%s not in changesets") % short(n), "manifest")

       try:
           for f, fn in mf.readdelta(n).iteritems():
               if not f:
                   err(lr, _("file without name in manifest"))
               elif f != "/dev/null":
                   fns = filenodes.setdefault(f, {})
                   if fn not in fns:
                       fns[fn] = i
       except Exception, inst:
           exc(lr, _("reading manifest delta %s") % short(n), inst)

   ui.status(_("crosschecking files in changesets and manifests\n"))

   if havemf:
       for c,m in sorted([(c, m) for m in mflinkrevs for c in mflinkrevs[m]]):
           err(c, _("changeset refers to unknown manifest %s") % short(m))
       mflinkrevs = None # del is bad here due to scope issues

       for f in sorted(filelinkrevs):
           if f not in filenodes:
               lr = filelinkrevs[f][0]
               err(lr, _("in changeset but not in manifest"), f)

   if havecl:
       for f in sorted(filenodes):
           if f not in filelinkrevs:
               try:
                   fl = repo.file(f)
                   lr = min([fl.linkrev(fl.rev(n)) for n in filenodes[f]])
               except:
                   lr = None
               err(lr, _("in manifest but not in changeset"), f)

   ui.status(_("checking files\n"))

   storefiles = set()
   for f, f2, size in repo.store.datafiles():
       if not f:
           err(None, _("cannot decode filename '%s'") % f2)
       elif size > 0:
           storefiles.add(f)

   files = sorted(set(filenodes) | set(filelinkrevs))
   for f in files:
       try:
           linkrevs = filelinkrevs[f]
       except KeyError:
           # in manifest but not in changelog
           linkrevs = []

       if linkrevs:
           lr = linkrevs[0]
       else:
           lr = None

       try:
           fl = repo.file(f)
       except error.RevlogError, e:
           err(lr, _("broken revlog! (%s)") % e, f)
           continue

       for ff in fl.files():
           try:
               storefiles.remove(ff)
           except KeyError:
               err(lr, _("missing revlog!"), ff)

       checklog(fl, f, lr)
       seen = {}
       for i in fl:
           revisions += 1
           n = fl.node(i)
           lr = checkentry(fl, i, n, seen, linkrevs, f)
           if f in filenodes:
               if havemf and n not in filenodes[f]:
                   err(lr, _("%s not in manifests") % (short(n)), f)
               else:
                   del filenodes[f][n]

           # verify contents
           try:
               t = fl.read(n)
               rp = fl.renamed(n)
               if len(t) != fl.size(i):
                   if len(fl.revision(n)) != fl.size(i):
                       err(lr, _("unpacked size is %s, %s expected") %
                           (len(t), fl.size(i)), f)
           except Exception, inst:
               exc(lr, _("unpacking %s") % short(n), inst, f)

           # check renames
           try:
               if rp:
                   fl2 = repo.file(rp[0])
                   if not len(fl2):
                       err(lr, _("empty or missing copy source revlog %s:%s")
                           % (rp[0], short(rp[1])), f)
                   elif rp[1] == nullid:
                       ui.note(_("warning: %s@%s: copy source"
                                 " revision is nullid %s:%s\n")
                           % (f, lr, rp[0], short(rp[1])))
                   else:
                       fl2.rev(rp[1])
           except Exception, inst:
               exc(lr, _("checking rename of %s") % short(n), inst, f)

       # cross-check
       if f in filenodes:
           fns = [(mf.linkrev(l), n) for n,l in filenodes[f].iteritems()]
           for lr, node in sorted(fns):
               err(lr, _("%s in manifests not found") % short(node), f)

   for f in storefiles:
       warn(_("warning: orphan revlog '%s'") % f)

   ui.status(_("%d files, %d changesets, %d total revisions\n") %
                  (len(files), len(cl), revisions))
   if warnings[0]:
       ui.warn(_("%d warnings encountered!\n") % warnings[0])
   if errors[0]:
       ui.warn(_("%d integrity errors encountered!\n") % errors[0])
       if badrevs:
           ui.warn(_("(first damaged changeset appears to be %d)\n")
                   % min(badrevs))
       return 1

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